It's Thursday, so you know what it means, Neatoramanauts: it's time for the What Is It? Game, brought to you by the wonderful What Is It? Blog.

What is this thing in the picture? Your guess can win you a free T-shirt of your choice from the NeatoShop! Here's how to play:

Place your guess in the comment section below. One guess per comment, but you can enter as many guesses as you'd like in separate comments. Post no URLs or weblinks.

You might know what they are, but if you want to win a t-shirt, you'll have to use your imagination, because we are going to select two winners who give us the funniest incorrect guesses. If you guess right, then good for ya - but you don't win anything, mmkay? So, it's up to you, funny people: you have twice the chance of winning that T-shirt.

Please write your T-shirt selection alongside your guess. If you don't include a selection, you forfeit the prize. We highly suggest you take a look at the NeatoShop's new selection of Funny T-shirts and Science T-Shirts.

Update: the pictured object is a lid from a mason jar mouse trap, patent number 1,077,104. Mmm, mouse in a jar! A lot of people got the answer right, or close to it, even when they were trying to be funny.

Lucas Gentry wins a t-shirt for the genius idea of a pickle-jar lid, in which a pickle is speared for easy retrieval every time the lid is put on. Someone should make that! The other winner is pascals_force, who said “It's a cleverly modified lid for those that just HATE dropping the lid and having it land on the wrong side.” That’s nonsensical enough to win a t-shirt! Thanks to everyone who played this week. See the answers to all this week’s mystery itms at the What Is It? blog.